Galvanic battery.



' Y tages are instance,

WILHELM HICKMANN,

MISCHE FABRIK GRIESHEIM-ELEKTRON, A conronarron: or GERMANY.

OF FBANKFORT-ON-THE-M AIN, GERMANY, ASSIGNOR I0 CHE- OF FRANKFORT-ON-THE-MAIN, GERMANY,-.

GALVANIG BATTERY.

No Drawing. Application filed May 1 0, 1

To all whom it may concern Be it known that I, WILHELM HICKMANN, a subject of the German Emperor, and resident of Frankfort-on-the-Main, Germany, have invented certain newand useful Improvements in Galvanic'Batteries, of which the following is a specification.

This invention relates to improvements in galvanic batteries and more particularly in galvanic batteries of the Leclanch type.

One of the objects of the invention is to provide a galvanic cell in which an acid manganite acts as the depolarizer.

Other objects and the novel features of the invention will be apparent from the following description.

It is well known that the efficiency of the Leclanch cell or battery is greatly increased if hydrated peroxid of manganese, theformula of which is H QMnO or 11 M110 or MnOS I be u'sedas a depolarizer. 'Thisis due, among other reasons, to the fact that the hydrate of manganese dioxid is readily capable of reduction and in consequence of' its acid character it is adapted to combine with the bases resulting from the working ofthe cell so that premature precipitationof the same and the attendant disadvanchecked as much as possible. For if the formed base contains a metal such as Zn and all the in I-LMnOj, is replaced thereby a normal manganite, as ZnO.MnO is obtained thus,

However, only a part of; the H in H,Mn0 is replaced by such a metal, an. acid manganite, as for instance is obtained. It has, however, been found dioxid also has injurious effects when acting as an acid. It enters into mutual reaction with the salts of the electrolyte up to a certain state of. chemical equilibrium, taking up therethrough apart of the free base and liberating a corresponding amount of acid. When the hydrate of manganese dioxid enters into reaction with a salt of the electrolyte, only Specification of Letters Patent.

' dioxid, an acidsalt ing acids from Patented Feb. 29, 191

911. Serial No. 626,217.

acid manganites are formed, for instance, according to the following formula:'

(X being any number above 10). So long as the acid is held back in the depolarizing mass it is harmless, but if, asin the case of dry cells or batteries which are ke t inactive for a long time, 't reaches by di usionthe metallic electrode the same is attacked and hydrogen evolved. takes place 2' inactive save for a very short time. I have The. following reaction found that this disadvantage can be obviated if, instead of hydrate. of manganese of the'same, an aci I have found that these manganite be used.

capable of liberatacid manganites are not lyte, although they have the power of taking up bases formed-in the working of the cell and preventing their separation, which is advantageous for the efliciency of the cell or battery. If, for instance, the acid manganite ZnH,,Mn,,O is used it is no longer able to liberate hydrochloric acid from ZnCl but is not yet fully able by tr'eating'rich basic manganites such dilute acids whereby as'Weldon mud with a portion may be obtained by.treating hydrate of manganese dioxid with salts or bases.

-Hydrate of manganese vdioxid takes up a the-salts used as an electrosaturated with base, for 'whichreason it is afterward, when the cells of the base 1s removed, or they 7 slight amount of base in neutral salinesolutions, but the partial saturatlon ls'suflicient to prevent a subsequent release of the acid from the electrolyte. In basic solutions, such as ammonia or ammoniacal zinc chlorid solutions, it unites with a considerable amount of base and for this reason it is not advisable to use bases beyond the amount required in order that the manganite formedshall be able to unite with the further amount of bases formed during the working of the cell. It is preferable, for the purpose of partially neutralizing the acidity of the hydrate of manganese dioxid, to seof metals which are, also lect salts, or bases,

present in the component arts of the cell,

' Leclanch type, manganite.

4 and Zn in the or battery, for instance, N

This has the ad- 2. A depolarizer, for use in combination electrolyte.

prlsing an acid manganite.

3. A depolarizer-for use in combination with the cathode in a Leclanch'cell comprising an acid manganite, a portion of the hydrogen of which has been replaced byv an element present in a component part of a the cell.

4. In a galvanic cell comprising positive and negative elements, containlng a manganite.

5. A depolarizer for use in combination with the cathode in a Leclanch cell contain .mg an acid manganite adapted to unite with bases formed in the operation of the battery but unable to liberate acid from the salts of the electrolyte. I

6. A depolarizing mass for use with an electrode of a galvanic cell, said depolarizing mass containing an acid manganite.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

' WILHELM HIOKMAN N Witnesses:

FRANZ HAssLAcHER, MICHAEL VOLKE.

with the cathode in a Leclanch cell, com- 1 a depolarizing mass 

